Complex Patterns of Inheritance

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2 Simple Inheritance Mendel studied simple patterns of inheritance.Found that inheritance was controlled by a dominant allele (B) or recessive allele (b).However, there are many inheritance patterns that are more complex.Most traits aren’t simply dominant or recessive.

6 Codominance Codominant alleles --- Both alleles are expressed equally.Example --- when a certain variety of black chicken is crossed with a white chicken, all offspring are checkered (black & white).Both feather colors are produced by codominant alleles.

7 Multiple AllelesMultiple alleles --- traits controlled by more than 2 alleles.Example of a trait controlled by multiple alleles is blood type.